I think the Walz Stolen Valor argument could do some real damage but it will be ignored by the MSM and buried, just like the Hunter Biden Laptop.
The only way to counter their control of the narrative is to do something that is impossible to suppress. For example, a Trump-Vance rally at a location with a large military presence where they could fly as many of these guys who are accusing Walz in as possible. Call it a “Anti Stolen Valor Rally” with bigtime military heros present.
We just have a history of failing to capitalize on opportunities...
I live just north of Military City USA. Vance could do very well here in San Antonio.